#app {
  margin: 0 auto;
  min-height: 100vh;
  box-sizing: border-box;
  position: relative;
  background-color: #ededed;
  display: none;
}
.main {
  height: calc(100vh - 130px);
  overflow-y: scroll;
}
.main::-webkit-scrollbar {
  width: 3px;
  height: 3px;
  background-color: transparent;
}
.main::-webkit-scrollbar-track {
  background-color: transparent;
}
.main::-webkit-scrollbar-thumb {
  border-radius: 3px;
  background-color: #999;
}

.item_box {
  padding: 8px;
  margin: 8px;
  display: flex;
  margin-top: 0;
  align-items: center;
}
.content {
  padding: 10px;
  border-radius: 4px;
  background-color: #fff;
}
.join_box,
.user_box {
  text-align: left;
  font-size: 12px;
  color: #999;
  padding: 0 16px;
}
.join_box {
  padding: 8px;
  text-align: center;
}
.is_me .user_box {
  text-align: right;
}
.is_me .item_box {
  justify-content: flex-end;
}
.is_me .content {
  background-color: #95eb6c;
}

/* 底部输入框 */
.foot_input {
  width: 100%;
  position: absolute;
  bottom: 20px;
  left: 0;
  z-index: 10;
  box-sizing: border-box;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}
.textarea_box ::-webkit-scrollbar {
  display: none;
}
